#include "networker/net/EventLoopThreadPool.h"
#include "networker/net/EventLoop.h"
#include "networker/net/EventLoopThread.h"
#include "stdio.h"

using namespace networker;
using namespace networker::net;

EventLoopThreadPool::EventLoopThreadPool(EventLoop *baseLoop, const string& nameArg)
    :baseLoop_(baseLoop), name_(nameArg), started_(false),
    numThreads_(0), next_(0)
{
}

EventLoopThreadPool::~EventLoopThreadPool()
{
    // 不要删除循环，这是堆栈变量
}

void EventLoopThreadPool::start(const ThreadInitCallback& cb)
{
    assert(!started_);
    baseLoop_->assertInLoopThread();

    started_ = true;

    for (int i = 0; i < numThreads_; ++i) {
        char buf[name_.size() + 32];
        snprintf(buf, sizeof(buf), "%s%d", name_.c_str(), i);
        EventLoopThread* t = new EventLoopThread(cb, buf);
        threads_.push_back(std::unique_ptr<EventLoopThread>(t));
        loops_.push_back(t->startLoop());
    }

    if (numThreads_ == 0 && cb) {
        cb(baseLoop_);
    }
}

// 获取一个线程
EventLoop* EventLoopThreadPool::getNextLoop()
{
    baseLoop_->assertInLoopThread();
    assert(started_);
    EventLoop *loop = baseLoop_;

    if (!loops_.empty()) {
        // round-robin
        loop = loops_[next_];
        ++next_;
        if (implicit_cast<size_t>(next_) >= loops_.size()) {
            next_ = 0;
        }
    }

    return loop;
}

EventLoop* EventLoopThreadPool::getLoopForHash(size_t hashCode)
{
    baseLoop_->assertInLoopThread();
    EventLoop *loop = baseLoop_;

    if (!loops_.empty()) {
        loop = loops_[hashCode % loops_.size()];
    }
    return loop;
}

std::vector<EventLoop*> EventLoopThreadPool::getAllLoops()
{
    baseLoop_->assertInLoopThread();
    assert(started_);

    if (loops_.empty()) {
        return std::vector<EventLoop*>(1, baseLoop_);
    } else {
        return loops_;
    }
}